'We have done a lot to try and help, and we hope that our EU friends will see sense and come to the table with something themselves'
British and EU negotiators plunged into the final hours of their scramble for a post-Brexit trade deal on Friday, deeply divided on the highly-charged issue of fishing rights.
The UK will leave the EU single market in less than two weeks and time has all but run out for any agreement to be approved in time to head off a severe economic shock.
The European Parliament has demanded that it see the text of any accord by Sunday at the latest, and the UK government says it will not allow talks to go beyond December 31.
EU member states do not recognise the parliament's deadline, but Brussels' chief Brexit negotiator Michel Barnier told the MEPs before heading to talks with his UK counterpart David Frost that on Friday marked a "moment of truth."
"We have very little time remaining, just a few hours to work through these negotiations... if you want this agreement to enter into force on January 1," he said.
Britain's Prime Minister Boris Johnson, visiting Bolton in northern England, said: "Our door is open. We will keep talking but I have to say that things are looking difficult and there's a gap that needs to be bridged.
"We have done a lot to try and help, and we hope that our EU friends will see sense and come to the table with something themselves," he said.
Britain left the European Union on January 31 and will leave the EU single market on December 31 at midnight, with or without a follow-on accord.
Without a trade deal, cross-Channel trade will be conducted on basic WTO rules and a market built over 47 years of economic integration will be disrupted by tariffs on goods.
Johnson admitted "it might be difficult at first but this country will prosper mightily."
Late on Thursday, Johnson and EU chief Ursula von der Leyen held talks by phone that failed to break the logjam in the eight-month-old negotiation.
After the call, a Downing Street spokesperson said the negotiations "were now in a serious situation" and that "agreement would not be reached unless the EU position changed substantially."
Unlike previous encounters, which resulted in a joint EU-UK statement, von der Leyen gave her own account of the call.
"Big differences remain to be bridged, in particular on fisheries," she said. "Bridging them will be very challenging."
Barnier confirmed that fish remains the main sticking point, with both sides now moving closer on the broader rules for ensuring fair competition.
And he stressed that the issue of fish could not be side-stepped: "Everything comes together as a whole. Nothing's agreed until everything is agreed."
Britain is adamant that it will decide who gets to fish it in its waters after January 1, but Brussels wants to secure a long-term agreement guaranteeing access for EU boats.
"On a personal note, I don't think it would be fair, nor acceptable, if European fishermen were not allowed... to have access to those waters," he said.
If the deal passes, he said, British companies trading in other areas would "remain stable in their rights," but EU fishing crews could lose out.